List of telephony terminology
This is a List of telephony terminology and acronyms which relate to telephony networks.
A
- Advanced Intelligent Network, (AIN), see also IN or Intelligent Network
- Automatic number announcement circuit (ANAC)
- Automated Attendant
- ACD - Automatic call distributor
- Articulation score
B
- Blue box - a device that was used to bypass the normal long-distance call switching tones typically used to obtain free calls.
C
- Call originator - (or calling party, caller or A-party) a person or device that initiates a telephone call by dialling a telephone number.
- Call waiting - a system that notifies a caller of another incoming telephone call by sounding a sound in the earpiece.
- Called party - (or callee or B-party)
- Caller
- Calling party
- Conference call (multi-party call)
- COCOT
E
- Emergency telephone number
- End instrument
- Engset calculation
- Erlang unit
F
- Fax - (contraction of facsimile) a device connected to the telephone network to enable documents to be scanned and sent to a receiving fax machine
- Frame - A distribution frame, a set of open wiring racks where circuits are cross connected to trunks and equipment
I
- Infrastructure
- Intelligent Network (IN)
- Interface functionality
- Inside plant
- Intelligent Network Interface Device (iNID) - replaces the Network Interface Device outside a subscriber's house like when customers subscribe to AT&T's U-verse brand of services.
- Interactive voice response (IVR)
- ISDN User Part (ISUP)
P
R
- Receiver Off-Hook tone (ROH)
- Red telephone box
- Red box
- Regional Bell Operating Company (RBOC)
- Ringer equivalency number (REN)
- Ringing signal
- Rural radio service
S
- Smartphone
- Station-to-station
- Signalling System 7 (SS7)
T
W
- Western Union
- Wide Area Telephone Service (WATS)
- WATS line
- Wireless network
- Wireless Telephony Applications Interface (WTAI)
- Wi-Fi
Acronyms
| Acronym | Name | Notes |
|---|---|---|
| 1ESS | Number 1 Electronic Switching System (Alcatel-Lucent) | US |
| 1FR | Flat rate service | US |
| 2G | second-generation mobile telephone | |
| 2.5G | Enhanced 2G mobile telephone | |
| 3G | third-generation mobile telephone | |
| 4ESS | Number 4 Electronic Switching System (Alcatel-Lucent) | |
| 4WTS | Four-wire termination set | US |
| 5ESS | Number 5 Electronic Switching System (Alcatel-Lucent) | |
| ACD | Automatic Call Distribution/Director | |
| ACTS | Advanced Coin Telephone Service | US |
| ADSL | Asymmetric Digital Subscriber Line | |
| ANI | Automatic Number Identification | US |
| AMA | Automatic Message Accounting | US |
| BOK | Unblocking | UK |
| CCIS | Common Channel Interoffice Signaling | |
| CID | Caller ID | |
| CLEC | Competitive Local Exchange Carrier | US |
| CLI | Caller Line Identification | Europe |
| CLID | Caller Line ID | UK |
| CTI | Computer telephony integration | |
| COSMOS | Wire records | |
| DDCO | Direct Dial Central Office (Opposite of DID) | US |
| DDD | Direct Distance Dialing | US |
| DDI | Direct Dialing In | UK |
| DECT | Digital Enhanced Cordless Telecommunications | |
| DID | Direct Inward Dialing | US |
| DMS | Digital Multiplex System (e.g. DMS-100) | Can |
| DNIS | Dialed Number Identification System | US |
| DSL | Digital subscriber line | |
| DTMF | dual-tone multi-frequency | |
| FDM | Frequency-division multiplexing | |
| GPRS | General Packet Radio Service | |
| GSM | Global system for mobile communications | |
| GST | Ground Start Trunk | US |
| IDDD | International Direct Distance Dialing | US |
| IDF | Intermediate distribution frame | US |
| ILEC | Incumbent Local Exchange Carrier | US |
| ISD | International Subscriber Dialing | UK and India |
| ISDN | Integrated Services Digital Network | |
| IVR | Interactive Voice Response (a.k.a. VRU) | |
| KSU | Key Switching/System Unit | US |
| LST | Loop Start Trunk | US |
| MDF | Main Distribution Frame | |
| MF | Multi-frequency | US |
| PABX | Private Automatic Branch eXchange | Europe |
| PBX | Private Branch eXchange | US |
| PMBX | Private Manual Branch eXchange | UK |
| POTS | Plain Old Telephone Service | |
| PSTN | Public Switched Telephone Network | |
| RCMAC | Recent Change Memory Administration Center | US |
| REN | ringer equivalency number | |
| SMS | Short Message Service (i.e. text messages) | |
| SF | Single Frequency supervision tone (2600) | US |
| SIP | Session Initiation Protocol | US |
| SP Lock | Unlocking | UK |
| SS7 | Signaling System 7 | |
| STD | Subscriber trunk dialling | UK and India |
| T-CXR | T-carrier (e.g. T-1) | US |
| TAPI | Telephony Application Programming Interface | |
| TR | Tip and ring | US |
| TSPS | Traffic Service Position System | |
| TXE | Telephone eXchange Electronic | UK |
| UAX | Unit Automatic eXchange | UK |
| VoIP | Voice over Internet Protocol | US |
| WAP | Wireless Application Protocol | |
| WATS | Wide Area Telephone Service | US |
| WTAI | Wireless Telephony Applications Interface |
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